App crashes when search prediction is clicked about flutter_google_places HOT 5 CLOSED

class _SearchBarState extends State<SearchBar> {
  GoogleMapsPlaces _places = GoogleMapsPlaces(apiKey: apiKey);

  @override
  Widget build(BuildContext context) {
    return FloatingActionButton(
      mini: true,
      heroTag: "ssearch",
      onPressed: () async {
        Prediction p =
            await PlacesAutocomplete.show(context: context, apiKey: apiKey, mode: Mode.overlay);
        displayPrediction(p);
      },
      child: Icon(Icons.search),
    );
  }

  Future<Null> displayPrediction(Prediction p) async {
    if (p != null) {
      PlacesDetailsResponse detail =
          await _places.getDetailsByPlaceId(p.placeId);

      var placeId = p.placeId;
      double lat = detail.result.geometry.location.lat;
      double lng = detail.result.geometry.location.lng;

      var address = await Geocoder.local.findAddressesFromQuery(p.description);

      print(lat);
      print(lng);
    }
  }
}